<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<style>
.clamp {
  font: 16px / 32px serif;
  white-space: pre-wrap;
}
.ruby-under ruby {
  ruby-position: under;
}
</style>
<div class="clamp"><ruby>一<rt>いち</ruby><ruby>行<rt>ぎょう</ruby><ruby>目<rt>め</ruby>
<span class="ruby-under"><ruby>ニ<rt>に</ruby><ruby>行<rt>ぎょう</ruby><ruby>目<rt>め</ruby></span>
<ruby>三<rt><ruby>さん<rt>san</ruby></ruby><ruby>行<rt><ruby>ぎょう<rt>gyou</ruby></ruby><ruby>目<rt><ruby>め<rt>me</ruby></ruby>…</div>
